
<html>
<head>
<body>


<input id="BValue" type="text" value="0.5"/>
<input type="button" value="Click to Change" onclick="pecs.style.opacity=BValue.value"/>


<svg width="100%" height="100%" version="1.1" xmlns="http://www.w3.org/2000/svg">
<path id="pecs" d="M30,110 C30,110 5,55 30,10 L50,10 C50,10 75,55 50,110 Z" stroke="black" stroke-width="1" fill="#F62217" fill-opacity="1" />
</svg>


</body>
</html>